Reference summary — not medical advice or a personal risk estimate.
Night shift work
Group 2A — probably carcinogenicPersonal HabitsbehavioralEvidence: limited_in_humans
Summary
Shift work that disrupts circadian rhythms is possibly associated with breast and other cancers.
Detail
IARC classifies night shift work as Group 2A with limited evidence for breast, prostate and colorectal cancer. The proposed mechanism involves circadian disruption and reduced melatonin secretion.
Regional relevance
global
global
Documented in these products
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Sources
Consumer references
Third-party tools some readers use alongside primary evidence. Meyron doesn't endorse them; we link them because you'll otherwise hit them anyway.
- California Prop 65 list
State of California's list of chemicals known to cause cancer or reproductive harm.